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薄板受冲击时产生的挠度会使接触半径大于直接由赫兹接触定律所得的接触半径。本文提出两种考虑薄板挠度的接触半径修正方法,首先使用赫兹接触定律初步计算接触半径,再联立层压板挠度公式和冲击头表面的几何方程得出修正的接触半径,用有限元模型验证了接触半径修正方法的有效性。使用基于层间剪切强度的分层阈值力(DTL)准则,提出了根据少量测试样本预测不同厚度层压板在不同半径冲击头作用下分层阈值力的方法。使用该方法预测了不同冲击参数下复合材料翼盒蒙皮的低速冲击分层阈值力。结果表明,使用了修正的接触半径后,预测精度有大幅的提高。
The deflection caused when the sheet is subjected to impact causes the contact radius to be greater than the contact radius obtained directly from Hertzian law of contact. In this paper, two methods of contact radius correction considering the deflection of the thin plate are proposed. First, the contact radius is calculated based on the Hertzian contact law, and the contact radius of the joint is calculated. Effectiveness of the contact radius correction method. Using the criterion of layered threshold force (DTL) based on interlaminar shear strength, a method of predicting the delamination threshold force of laminates with different thickness under different radius impact heads is proposed based on a few test samples. The method is used to predict the threshold velocity of the low velocity impact stratification of the composite wing box skin under different impact parameters. The results show that the prediction accuracy is greatly improved with the revised contact radius.